Credit cards suddenly become unusable, which may be caused by the following reasons:

1. The credit card transaction amount exceeds the set limit

Nowadays, most bank credit cards can be used Set transaction limit limits, such as how many transactions can be made per day, what is the transaction limit, or what is the total transaction limit in a billing cycle. This function mainly plays a role in protecting the safety of funds and preventing excessive losses during theft. If the cardholder has set a transaction limit, he can log in to online banking or mobile client, modify the limit limit there, or close the limit, and then he can use it normally. After swiping the card, you can also modify the limit to ensure the safety of credit card funds.

2. The credit card limit was reduced by the bank

Due to various reasons, the credit card limit was reduced by the bank, but the bank did not notify the cardholder. For example, if the original credit limit of a cardholder is 20,000, if the cardholder has overdrafted 10,000, the remaining limit will be 10,000. But the bank suddenly reduces the credit card limit from 20,000 to 10,000, so the remaining limit is 0. When the cardholder swipes the card for consumption, he will not be able to make transactions. In this case, the cardholder needs to call the bank to ask the reason for the reduction and see if he can apply to restore the limit.

3. The use of credit cards is not compliant

According to regulations, credit cards can only be used for normal consumption, but many cardholders often swipe their cards at wholesale merchants. After too many times, they will Being restricted by the system to certain categories, especially wholesale merchant transactions, such as being unable to continue swiping cards at wholesale merchants; or being limited in the amount of a single transaction.

4. There are risks in credit card transactions

A certain transaction may have risks, triggering the bank's risk control system, causing the transaction to fail. Common situations include swiping cards at the POS of merchants that are blacklisted by banks, sudden overseas transactions without registration, etc. In this case, you can switch to another merchant for consumption. If it is overseas consumption, some banks need to call in advance to register. This is also to ensure the safety of credit card funds.

5. Transaction equipment failure problem

If there is a problem with the transaction system, such as network delay, equipment problems, etc., generally you can just swipe the card again after a while.